RDG603A31- Issue 4
Page 36 of 88
Skin tanks will also need to be increased by up to approx. 10% to dissipate the additional
heat generated, when a hydraulic drive system or hydraulic bow thruster is used.
An additional separate skin tank of suitable capacity with separate water circulating pump
may need to be fitted for a hydraulic drive transmission.
Hydraulic oil coolers should be installed after the engine, not before. Coolers
that are installed before the engine will invalidate the engine warranty.
22. Centa Coupling CF-M-160 (RDG2779)
Centa have given Barrus permission to use the following instruction on how to fit the coupling:
When assembling the coupling all the bolts and nuts must be tightened to the correct torque
using a torque wrench.
Tightening by “feel” will not give a satisfactory result.
Remove the clamping bush from the coupling.
Degrease the propeller shaft and the bore of the clamping hub. Leave the special
grease only in the tapered bore of the coupling hub, and on the outside of the clamping
hub.
DO NOT USE SOLVENTS.
Mount the coupling onto the gearbox output flange. Note: The M10 tapped holes in
the coupling are 15/17mm, so care must be taken to use screws or studs of the correct
length. Centa recommend the use of M10 x 25 screws or M10 x 40 studs. If using
studs the shorter (10mm) screwed portion should be inserted into the coupling.
TIGHTENING TORQUE IS 45Nm
Push the clamping hub fully onto propeller shaft.
Connect the clamping hub/propeller shaft onto the coupling. The connecting screws
of the clamping bush must be tightened alternately in several steps until the required
tightening torque is reached. Finally, the tightening torque of all fasteners must be
checked all round.
TIGHTENING TORQUE (M12x40) is 79Nm
The tightening of the connecting screws between the clamping bush and the
hub means that the clamping hub/propeller shaft will be dragged into the coupling by
a few millimetre’s, thereby effectively shortening the installation length. Sufficient free
space (minimum 10mm) should be available between the outer bearing and the
propeller hub.
